【作者】 龙北红；

【导师】 于文学； 金曾孙；

【作者基本信息】 吉林大学 ， 材料物理与化学， 2006， 博士

【摘要】 本文采用微弧氧化(MAO)技术在钛及其合金表面制备了MAO膜,研究了工艺参数对MAO膜的生长特性、微结构、相结构等的影响。首先,采用自制频率固定的交流MAO膜制备系统,分别研究了恒定电压和恒定电流密度下钛合金MAO过程中电学参量、微结构、相组成等的变化规律。其次,采用频率固定的交流MAO膜的制备系统和多功能MAO膜的制备系统,分别研究了在恒定电压/电流密度以及不同电脉冲频率和占空比作用下工业纯钛MAO过程中膜的生长特性、微观结构和相组成的变化规律。在优化工艺参数的基础上,制备出表面颗粒尺寸在300nm～3μm之间的多孔TiO2薄膜,并研究了颗粒尺寸,相组成等随处理时间的变化规律。更多还原

【Abstract】 MAO coatings have intensively attracted the attention of many research groups due to its desirable characteristics, especially the coatings on the substrates of titanium and its alloys. Recently years, the performances in all fields and application on the coatings fabricated by MAO have been developing and studying by many units in the world. Because MAO is a complicated process, which is controlled by multifactor, different technical parameters, as-deposited MAO coatings show various properties. Moreover, the experimental and theoretical results are not systematic or complete. Therefore, further research work on preparation and characterization of MAO coatings on the substrates of titanium and its alloys, which are extensively used in many various fields, is needed. In this thesis, evaluated as a new material, MAO coatings on the substrates of titanium and its alloys are studied systematically in which the effect of deposited parameters on coating properties is investigated. It is our goal to fabricate the MAO coatings with the outstanding characteristics. The coatings on titanium and its alloys substrates are prepared by means of a self-made industrial frequency power supply with a real data collecting system of electrical current and voltage. During experiments, the effect of basic deposited parameters on MAO coatings properties is studied, and the parameters are optimized. Simultaneously, the coatings with excellent properties are obtained in the optimized experimental conditions. On the basis of these, the effect of the electrical parameters on characterization of MAO coatings on pure titanium are studied by a self-made multifunctional MAO power supply.This thesis consists of three parts. In the first part, the coatings on TC4 titanium alloy substrate are fabricated under the condition of the constant voltage and current density. The variations of the electrics parameter against treatment time are studied during MAO process, and the effects of treating parameters on the coating characterization are also discussed. The results show that the current variations with treating time include obviously更多还原